My coolant warning light came on a little while back, so I checked it and found it was a bit low. About an inch below the 'MIN' marker in fact
Anyway, I topped it up with water, but noticed that there was a gunky, oozy, nasty, slimy mess that looked like it had leaked from one of the pipes and dripped down the outside of the coolant expansion tank. I cleaned it up and hoped for the best.
I noticed a smell while sitting in traffic yesterday, a kind of chemically burning smell. Checked the temp gauge on the dash, but no problem there, sitting at 90 degrees, same as always. The traffic started moving and the smell disappeared. I got home, popped the bonnet and there was more coolant residue down the side of the expansion tank.
I'm obviously going to get it booked in to have it sorted, but how much water is it safe to add to the coolant before it loses its antifreeze properties? I've already added about a pint from the other week - do I need to top it up with coolant this time or will water be OK again?